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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198// SPDX-License-Identifier: GPL-2.0/* * arch/sh/kernel/process.c * * This file handles the architecture-dependent parts of process handling.. * * Copyright (C) 1995 Linus Torvalds * * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima * Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC * Copyright (C) 2002 - 2008 Paul Mundt */#include <linux/module.h>#include <linux/mm.h>#include <linux/sched/debug.h>#include <linux/sched/task.h>#include <linux/sched/task_stack.h>#include <linux/slab.h>#include <linux/elfcore.h>#include <linux/fs.h>#include <linux/ftrace.h>#include <linux/hw_breakpoint.h>#include <linux/prefetch.h>#include <linux/stackprotector.h>#include <linux/uaccess.h>#include <asm/mmu_context.h>#include <asm/fpu.h>#include <asm/syscalls.h>#include <asm/switch_to.h>
void show_regs(struct pt_regs * regs){ pr_info("\n"); show_regs_print_info(KERN_DEFAULT);
pr_info("PC is at %pS\n", (void *)instruction_pointer(regs)); pr_info("PR is at %pS\n", (void *)regs->pr);
pr_info("PC : %08lx SP : %08lx SR : %08lx ", regs->pc, regs->regs[15], regs->sr);#ifdef CONFIG_MMU pr_cont("TEA : %08x\n", __raw_readl(MMU_TEA));#else pr_cont("\n");#endif
pr_info("R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n", regs->regs[0], regs->regs[1], regs->regs[2], regs->regs[3]); pr_info("R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n", regs->regs[4], regs->regs[5], regs->regs[6], regs->regs[7]); pr_info("R8 : %08lx R9 : %08lx R10 : %08lx R11 : %08lx\n", regs->regs[8], regs->regs[9], regs->regs[10], regs->regs[11]); pr_info("R12 : %08lx R13 : %08lx R14 : %08lx\n", regs->regs[12], regs->regs[13], regs->regs[14]); pr_info("MACH: %08lx MACL: %08lx GBR : %08lx PR : %08lx\n", regs->mach, regs->macl, regs->gbr, regs->pr);
show_trace(NULL, (unsigned long *)regs->regs[15], regs, KERN_DEFAULT); show_code(regs);}
void start_thread(struct pt_regs *regs, unsigned long new_pc, unsigned long new_sp){ regs->pr = 0; regs->sr = SR_FD; regs->pc = new_pc; regs->regs[15] = new_sp;
free_thread_xstate(current);}EXPORT_SYMBOL(start_thread);
void flush_thread(void){ struct task_struct *tsk = current;
flush_ptrace_hw_breakpoint(tsk);
#if defined(CONFIG_SH_FPU) /* Forget lazy FPU state */ clear_fpu(tsk, task_pt_regs(tsk)); clear_used_math();#endif}
asmlinkage void ret_from_fork(void);asmlinkage void ret_from_kernel_thread(void);
int copy_thread(struct task_struct *p, const struct kernel_clone_args *args){ u64 clone_flags = args->flags; unsigned long usp = args->stack; unsigned long tls = args->tls; struct thread_info *ti = task_thread_info(p); struct pt_regs *childregs;
#if defined(CONFIG_SH_DSP) struct task_struct *tsk = current;
if (is_dsp_enabled(tsk)) { /* We can use the __save_dsp or just copy the struct: * __save_dsp(p); * p->thread.dsp_status.status |= SR_DSP */ p->thread.dsp_status = tsk->thread.dsp_status; }#endif
memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
childregs = task_pt_regs(p); p->thread.sp = (unsigned long) childregs; if (unlikely(args->fn)) { memset(childregs, 0, sizeof(struct pt_regs)); p->thread.pc = (unsigned long) ret_from_kernel_thread; childregs->regs[4] = (unsigned long) args->fn_arg; childregs->regs[5] = (unsigned long) args->fn; childregs->sr = SR_MD;#if defined(CONFIG_SH_FPU) childregs->sr |= SR_FD;#endif ti->status &= ~TS_USEDFPU; p->thread.fpu_counter = 0; return 0; } *childregs = *current_pt_regs();
if (usp) childregs->regs[15] = usp;
if (clone_flags & CLONE_SETTLS) childregs->gbr = tls;
childregs->regs[0] = 0; /* Set return value for child */ p->thread.pc = (unsigned long) ret_from_fork; return 0;}
/* * switch_to(x,y) should switch tasks from x to y. * */__notrace_funcgraph struct task_struct *__switch_to(struct task_struct *prev, struct task_struct *next){ struct thread_struct *next_t = &next->thread;
#if defined(CONFIG_STACKPROTECTOR) && !defined(CONFIG_SMP) __stack_chk_guard = next->stack_canary;#endif
unlazy_fpu(prev, task_pt_regs(prev));
/* we're going to use this soon, after a few expensive things */ if (next->thread.fpu_counter > 5) prefetch(next_t->xstate);
#ifdef CONFIG_MMU /* * Restore the kernel mode register * k7 (r7_bank1) */ asm volatile("ldc %0, r7_bank" : /* no output */ : "r" (task_thread_info(next)));#endif
/* * If the task has used fpu the last 5 timeslices, just do a full * restore of the math state immediately to avoid the trap; the * chances of needing FPU soon are obviously high now */ if (next->thread.fpu_counter > 5) __fpu_state_restore();
return prev;}
unsigned long __get_wchan(struct task_struct *p){ unsigned long pc;
/* * The same comment as on the Alpha applies here, too ... */ pc = thread_saved_pc(p);
#ifdef CONFIG_FRAME_POINTER if (in_sched_functions(pc)) { unsigned long schedule_frame = (unsigned long)p->thread.sp; return ((unsigned long *)schedule_frame)[21]; }#endif
return pc;}